cons of dart stack overflow code example

Example 1: stackover flow dart forloop

import 'dart:html';
  import 'dart:async';

  main() async {
  List li = ["-", "\\", "|", "/"];
    for (var i = 0; i < 400000000; i++) {
      querySelector('#test').text = li[i % 4];
      (await new Future.delayed(const Duration(seconds: 1)));
    }
  }

Example 2: forloop in dart stack overflow

for (var i = 0; i < li.length; i++) {
  // TO DO
  var currentElement = li[i];
}